EP2740931A1 - Pale d'éolienne à axe vertical et éolienne à axe vertical - Google Patents

Pale d'éolienne à axe vertical et éolienne à axe vertical Download PDF

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Publication number
EP2740931A1
EP2740931A1 EP13196130.2A EP13196130A EP2740931A1 EP 2740931 A1 EP2740931 A1 EP 2740931A1 EP 13196130 A EP13196130 A EP 13196130A EP 2740931 A1 EP2740931 A1 EP 2740931A1
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EP
European Patent Office
Prior art keywords
vertical
orthogonal
section
axis
appendages
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP13196130.2A
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German (de)
English (en)
Inventor
Marco Raciti Castelli
Ernesto Benini
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wind Twentyone Srl
Original Assignee
Wind Twentyone Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wind Twentyone Srl filed Critical Wind Twentyone Srl
Publication of EP2740931A1 publication Critical patent/EP2740931A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D3/00—Wind motors with rotation axis substantially perpendicular to the air flow entering the rotor 
    • F03D3/06—Rotors
    • F03D3/061—Rotors characterised by their aerodynamic shape, e.g. aerofoil profiles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/06—Rotors
    • F03D1/065—Rotors characterised by their construction elements
    • F03D1/0675—Rotors characterised by their construction elements of the blades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/20—Rotors
    • F05B2240/21—Rotors for wind turbines
    • F05B2240/211—Rotors for wind turbines with vertical axis
    • F05B2240/212—Rotors for wind turbines with vertical axis of the Darrieus type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/20—Rotors
    • F05B2240/21—Rotors for wind turbines
    • F05B2240/211—Rotors for wind turbines with vertical axis
    • F05B2240/214—Rotors for wind turbines with vertical axis of the Musgrove or "H"-type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/20—Rotors
    • F05B2240/21—Rotors for wind turbines
    • F05B2240/231—Rotors for wind turbines driven by aerodynamic lift effects
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2250/00—Geometry
    • F05B2250/20—Geometry three-dimensional
    • F05B2250/25—Geometry three-dimensional helical
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/96—Preventing, counteracting or reducing vibration or noise
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/74—Wind turbines with rotation axis perpendicular to the wind direction

Definitions

  • the present invention relates to a blade for vertical-axis wind turbine and a vertical-axis wind turbine according to the preamble of the respective independent claims.
  • the vertical-axis turbine and the relative wind blade according to the present invention are adapted to be employed for transforming, in a per se conventional manner, the kinetic energy of the wind into mechanical energy and then into electrical energy with a high aerodynamic efficiency.
  • the vertical-axis wind turbine and the relative blade, object of the present invention are therefore inserted in the technological field of renewable energies and, more particularly, in the industrial field of the production of wind generators.
  • the large size turbines operating in the most recent wind plants are generally of the type with horizontal axis and, more frequently, with three-blade rotor.
  • the above-described blades of the turbines are formed by a main body connected to the shaft of the turbine and by an appendage connected to the free end of the main body by means of a connector portion. More in detail, the connector portions provided in the blades of known type are extended between the end section of the main body and the root section from which the appendage departs; such end section and root section are arranged substantially at 90° from each other.
  • the vertical-axis turbines have several advantages with respect to horizontal-axis turbines, the most significant of which is constituted by the independence of the operation from the wind origin direction, which facilitates the use thereof in very populated areas, generally characterized by winds with inconstant direction.
  • Such turbine as described in the aforesaid patent, comprises a vertical rotation shaft and a plurality of blades, substantially rigid, mechanically coupled at their upper and lower ends to the shaft in order to rotate it and generate electrical energy in a conventional manner by means of a current generator coupled to the rotation shaft.
  • Each blade has the shape of an elongated body which is substantially extended with semicircular arc between its two ends and has section configured with wing profile, constant for its entire longitudinal extension.
  • wing profile is defined, in a per se known manner, by a dorsal surface and a ventral surface which are extended from the leading edge to the trailing edge of the air flow.
  • the different pressures produced by the air flow on the surfaces of the wing profile determine fluid-dynamic forces acting on the profile itself, which can be split into a lift component, responsible for the rotation of the turbine, and a resistance component.
  • the known turbines have several drawbacks, including a not particularly high efficiency, the formation of air vortices which in addition to not allowing the attainment of high efficiency, as stated, also cause irritating noise, as well as the generation of undesired twisting torques along the extension of the blades due to the sudden and repetitive passage of the blades themselves between angular work positions, in which the latter interfere with the flow of the wind by generating a lift component responsible for the rotation of the blade, and rest positions, in which the blades are traversed by the air flow without however generating significant fluid-dynamic forces on the same blades.
  • turbines have been developed of the abovementioned "Darrieus" type, described for example in the patents US 5,405,246 , US 2010/322770 and US 2011/280708 , in which the blades are fixed at their ends to the rotation shaft at angularly offset positions, in a manner so as to obtain a substantially helical longitudinal extension.
  • the blades are always subjected at at least one longitudinal section thereof, and at any angular position assumed by the blade, to a useful action by the fluid-dynamic forces produced by the wind.
  • Such blade geometry also allows a decrease of the noise caused by the rotor, since both the interaction between the blade and the wind and that between the blade and the tail of the shaft of the rotor are progressive, preventing irritating acoustic effects caused by sudden pressure variations in the field of motion around the blades.
  • a vertical-axis turbine which comprises a plurality of blades having substantially helical longitudinal extension, each of which is connected to the rotation shaft by means of an upper end spoke, a lower end spoke and a plurality of intermediate spokes. More in detail, the upper and lower end spokes are connected to the ends of the blade itself by means of aerodynamic connector portions.
  • the known turbine briefly described above nevertheless has low aerodynamic efficiency, since the numerous support spokes of the blades arranged therein, although provided with an aerodynamic profile, contribute to significantly increasing the wet surface area of the turbine itself and hence the viscous friction forces which act thereon.
  • the patent DE 20 2008 014 838 describes a vertical-axis wind turbine provided with blades having substantially helical extension.
  • Each blade is connected to the shaft of the turbine by means of a pair of spokes, including an upper spoke and a lower spoke connected to the ends of the blade itself by means of aerodynamic connector portions.
  • the latter known turbine has low aerodynamic efficiency due to the same grounds illustrated for the turbine described in the patent EP 1413748 .
  • the latter known turbine is subjected to structural problems, since its blades are connected to the rotation shaft by means of only end spokes and are thus subjected to high bending stresses during the operation of the turbine.
  • the problem underlying the present invention is therefore that of overcoming the drawbacks shown by the solutions of known type described above, by providing a vertical-axis wind turbine and a blade for vertical-axis wind turbine, which allow improving the aerodynamic efficiency of the same blade, thus allowing the generation of a greater quantity of mechanical and thus electrical energy.
  • Another object of the present finding is to provide a vertical-axis wind turbine and a blade for vertical-axis wind turbine which produce low acoustic emissions with respect to the known turbines.
  • Another object of the present finding is to provide a vertical-axis wind turbine and a blade for vertical-axis wind turbine which are of easy self-starting type.
  • Another object of the present finding is to provide a vertical-axis wind turbine which is entirely safe in use.
  • Another object of the present finding is to provide a vertical-axis wind turbine which is simple and inexpensive to obtain and entirely reliable in operation.
  • reference number 3 indicates overall a preferred embodiment of a blade in accordance with the present invention, intended to be mounted in a vertical-axis wind turbine, also object of the present invention and indicated overall with reference number 1 in the enclosed drawings.
  • Such turbine 1 is of the type "with lift” and comprises a rotor formed by a central rotation shaft 2 with vertical axis Z and by two or more blades 3 adapted to transmit a rotation motion to the central rotation shaft 2, around the aforesaid vertical axis Z.
  • the turbine 1 can comprise, if it is adapted for the production of electrical energy - in an entirely conventional manner - means for converting the mechanical energy of the shaft 2 into electrical energy, such a generator possibly mechanically connected to the shaft by means of a reducer (not illustrated), which are per se known to the man skilled in the art and hence are not discussed in more detail hereinbelow.
  • the turbine comprises three blades 3.
  • Each blade 3 is extended along a substantially helical longitudinal extension line 1 and is provided with an upper terminal portion 3' and a lower terminal portion 3", at which the blade 3 is mechanically coupled to the central rotation shaft 2 of the turbine 1, by means of at least one pair of spokes, 4' and 4". The latter are connected to the rotation shaft 2 in positions angularly offset with respect to each other.
  • each of the blades 3 comprises a central body 5 and two terminal appendages 6, connected to the central body 5 as is better explained hereinbelow.
  • the central body 5 is extended along the longitudinal extension line 1 and is provided with a section defining an aerodynamic profile P, i.e. a profile that is susceptible to produce a lift component aimed to conduct in rotation the central shaft 2 to which the blade 3 is fixed, when it is immersed in an air flow.
  • an aerodynamic profile P i.e. a profile that is susceptible to produce a lift component aimed to conduct in rotation the central shaft 2 to which the blade 3 is fixed, when it is immersed in an air flow.
  • the aerodynamic profile P of the central body 5 of each blade 3 is orthogonal to the longitudinal extension line 1 of the central body 5 itself, for the entire length of the latter, as is clearly visible in Fig. 2 . More in detail, the aerodynamic profile P is defined by a plurality of sections So orthogonal to the longitudinal extension line 1. In particular, such orthogonal sections So have the desired aerodynamic form and are substantially constant along the longitudinal extension line 1.
  • the orthogonal sections So are thus distinguished by chords having the same length c p , it being intended of course that the length of the chords of the different orthogonal sections So can vary slightly along the longitudinal extension line 1, in accordance with the manufacturing tolerances.
  • the aerodynamic profile P is extended horizontally, i.e. is defined by a plurality of aerodynamic sections arranged orthogonal to the vertical axis Z of the rotation shaft 2, regardless of the tilt angle of the longitudinal extension line 1.
  • the aerodynamic profile P of the central body 5 of the blades 3 can for example be a profile of NACA type.
  • each blade 3 is extended between an upper end 5', defined by a horizontal upper end section S s orthogonal to the vertical axis Z, and tilted with respect to the longitudinal extension line 1, as is inferred from Figures 4 and 5 , and a lower end 5", defined by a horizontal lower end section (S i ), it too orthogonal to the vertical axis Z and tilted with respect to the longitudinal extension line 1.
  • the horizontal upper end section S s and the horizontal lower end section S i are defined by a cut of the central body 5 along a horizontal plane ⁇ , as illustrated in Figure 2a .
  • the two appendages 6 are respectively connected to the upper end 5' and lower end 5" of the central body 5 and are each extended along a radial direction R substantially orthogonal to the vertical axis Z of the turbine 1, towards the central rotation shaft 2. More in detail, the appendages 6 are linearly extended along the substantially horizontal radial direction R and are provided with cross sections, orthogonal to the radial extension direction R, defining respective aerodynamic profiles.
  • chords of the aerodynamic profiles that define each of the appendages 6 preferably lie on a same substantially horizontal plane.
  • substantially orthogonal employed above, it is intended herein to indicate that the appendages 6 are extended parallel to a radial direction R that forms an angle comprised between 85° and 95° with the vertical axis Z of the turbine 1.
  • Each appendage 6 is extended between a root end 7, defined by a root section 7', lying on a plane substantially vertical and orthogonal to the radial direction R, and a free end 8 defined by an end section 8'.
  • the appendages 6 are connected to the upper end 5' and lower end 5" of the central body 5 by means of respective connector portions 9, each of which extended between the horizontal upper end section S s or lower end section S i of the central body 5 and the root section 7' of the corresponding appendage 6.
  • the connector portions 9, therefore, connect the horizontal upper end S s or lower end sections S i , which are arranged orthogonal to the vertical axis Z of the turbine, with the root sections 7' of the corresponding appendages 6, such root sections 7' extended on vertical planes parallel to the axis Z.
  • the connector portions 9 connect sections that are substantially orthogonal to each other.
  • each of the connector portions 9 is defined by a plurality of connector sections S r successive with respect to each other starting from the horizontal upper end section S s or lower end section S i of the central body 5 up to the root section 7' of the corresponding appendage 6.
  • Each of such connector sections S r has its own chord c r and is rotated with respect to the preceding connector section around its chord c r , such that the connector sections S r successive with respect to each other starting from the horizontal upper end section S s or lower end section S i are arranged in positions gradually approximate to a position parallel to the substantially vertical lying plane of the root section 7' of the appendage 6.
  • the connector sections S r therefore complete overall an angle of about 90°, in order to connect the horizontal upper end section S s or lower end section S i of the central body 5 with the substantially vertical root section 7' of the corresponding appendage 6.
  • the presence of the appendages 6 allows reducing the resistance induced by the blades 3.
  • the appendages 6, even if they determine an increase of the overall surface of the blade 3 and hence an increase of the viscous resistance of the blade 3, allow reducing the end vortices generated by the air flows that are moved from the region in overpressure at the intrados blade towards the region in reduced pressure at the extrados blade.
  • the presence in fact of a physical barrier constituted by the appendage 6 between the overpressure and reduced pressure zones allows obstructing the air flow, which would tend to flow from the intrados towards the extrados and which would generate a series of vortices that are separated from the trailing edge of the blade 3.
  • the size of the root sections 7' and end sections 8' of the appendage 6, as well as the length l w and the maximum thicknesses s w,r and s w,e of the root and end sections of the appendage must be selected in a manner so as to ensure the minimum increase of viscous resistance corresponding with the desired decrease of induced resistance.
  • the root section 7' of each of the appendages 6 is distinguished by a chord of length c w,r shorter than the length c p of the chord of the orthogonal sections So which define the aerodynamic profile P.
  • the length c w,r of the chord of the root section 7' of each of the appendages 6 is equal to 50%-70%, and preferably equal to about 60%, of the length c p of the chord of the orthogonal sections So which define the aerodynamic profile P.
  • each of the appendages 6, defined as the distance between the root section 7' and the end section 8', is, in accordance with an advantageous embodiment of the present invention, equal to 75%-150% of the length c p of the chord of the orthogonal sections So.
  • each of the appendages 6 is preferably substantially equal to the length c p of the chord of the orthogonal sections So.
  • the appendages 6 therefore have a length l w sufficient for reducing the formation of air vortices at the ends of the blades, but in any case limited, in order to prevent an excessive increase of the wet surface area of the blade and hence an excessive increase of its viscous resistance.
  • each of the appendages 6 has a length l w shorter than the distance D that separates the free end 8 of the appendage itself from the central rotation shaft 2 of the turbine 1.
  • the root section 7' of each of the appendages 6 is distinguished with a length c w,r of the chord, as well as by a maximum thickness s w,r .
  • the end section 8' of each of the appendages 6 is distinguished by a length c w,e of the chord and by a maximum thickness s w,e .
  • the chord of the end section 8' has a length c w,e equal to 40%-60%, and preferably equal to about 50%, of the length c w,r of the chord of the root section 7'.
  • the maximum thickness s w,e of the end section 8' is advantageously equal to 40%-60%, and preferably equal to about 50%, of the maximum thickness s w,r of the root section 7'.
  • the above-indicated size ratios have proven to be particularly advantageous for ensuring a decrease of induced resistance, and hence an increase of lift, corresponding to a small increase of viscous resistance due to the increase of the wet surface area of the blade.
  • the configuration of the blades 3 in accordance with the aforesaid size ratios therefore ensures an optimal efficiency of the turbine 1 in accordance with the present invention.
  • the blade 3 according to the present invention is extended along a longitudinal extension line 1 substantially helical around an axis Z, which coincides with the vertical axis of the turbine 1 when the blade 3 is mounted on the shaft 2 of the turbine 1.
  • the blade 3 comprises a central body 5 that is extended along the longitudinal extension line 1 with an aerodynamic profile P orthogonal to the longitudinal extension line 1 and is extended between an upper end 5', defined by a horizontal upper end section S s orthogonal to the axis Z and tilted with respect to the longitudinal extension line 1, and a lower end 5", defined by a horizontal lower end section S i , it too orthogonal to the vertical axis Z and tilted with respect to the longitudinal extension line 1.
  • the blade 3 further comprises, as specified above, two appendages 6 connected to the upper end 5' and lower end 5" of the central body 5, each of which extended along a radial direction R substantially orthogonal to the axis Z towards the axis Z itself, between a root end 7 defined by a root section 7', lying on a plane substantially vertical and orthogonal to the radial direction R, and a free end 8 defined by an end section 8'.
  • the appendages 6 are connected to the upper end 5' and lower end 5" of the central body 5 by means of respective connector portions 9, each of which extended between the horizontal upper end section S s or lower end section S i of the central body 5 and the root section 7' of the corresponding appendage 6.
  • the presence of the appendages 6 on the blades 3 in accordance with the present invention therefore allows, as specified above, increasing the efficiency of the turbine 1 that carries the aforesaid blades mounted, as well as limiting the acoustic emissions, due to the particular orientation of the aerodynamic profile P of the central body 5 of the blades 3 and the particular structural characteristics of the appendages 6.
  • each blade 3 is extended between an upper end 5' defined by an aerodynamic upper end section S s orthogonal to the longitudinal extension line 1 and tilted with respect to the vertical axis Z and a lower end 5" defined by an aerodynamic lower end section orthogonal to the longitudinal extension line 1 and tilted with respect to the vertical axis Z.
  • Each of the connector portions 9 is extended in such case between the aerodynamic upper end section S s or lower end section of the central body 5 and the root section 7' of the corresponding appendage 6.
  • each of the connector portions 9 is defined by a plurality of connector sections S r successive with respect to each other starting from the aerodynamic upper end section S s or lower end section of the central body 5 up to the root section 7' of the corresponding appendage 6.
  • Each of such connector sections S r has its own chord c r and is rotated with respect to the preceding connector section around at least one first rotation axis R' substantially parallel to the radial direction R and/or around its chord c r , such that the connector sections S r successive with respect to each other starting from the aerodynamic upper end section S s or lower end section are arranged in positions gradually approximate to a position parallel to the substantially vertical lying plane of the root section 7' of the appendage 6.
  • the root section 7' of each of the appendages 6 is distinguished by a chord of length c w,r shorter than the length c p of the chord of the aerodynamic upper end section S s or lower end section and the connector sections S r have a chord c r of length progressively decreasing in moving away from the aerodynamic upper end section S s or lower end section.
  • the length c w,r of the chord of the root section 7' of each of the appendages 6 is equal to 50%-70%, and preferably equal to about 60%, of the length c p of the chord of the aerodynamic upper end section S s or lower end section.
  • each of the appendages 6, defined as the distance between the root section 7' and the end section 8', is, in accordance with an advantageous embodiment of the present invention, equal to 75%-150% of the length c p of the chord of the aerodynamic upper end section S s or lower end section.
  • each of the appendages 6 is preferably substantially equal to the length c p of the chord of the aerodynamic upper end section S s or lower end section.
  • the chord of the end section 8' has a length c w,e equal to 40%-60%, and preferably equal to about 50%, of the length c w,r of the chord of the root section 7'.
  • the maximum thickness s w,e of the end section 8' is advantageously equal to 40%-60%, and preferably equal to about 50%, of the maximum thickness s w,r of the root section 7'.
  • Figure 11 reports the comparison between the power coefficient per blade height unit, as previously defined in relation to Figure 7 (the same reference numbers are maintained in both figures), generated by a three-blade rotor without aerodynamic appendages (represented in the graph of Figure 11 with a line marked with round points) and that generated by the same machine where aerodynamic appendages were applied in accordance with the latter embodiment.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Wind Motors (AREA)
EP13196130.2A 2012-12-06 2013-12-06 Pale d'éolienne à axe vertical et éolienne à axe vertical Withdrawn EP2740931A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000369A ITPD20120369A1 (it) 2012-12-06 2012-12-06 Turbina eolica ad asse verticale e pala per turbina eolica ad asse verticale

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EP2740931A1 true EP2740931A1 (fr) 2014-06-11

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IT (1) ITPD20120369A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018184291A1 (fr) * 2017-04-07 2018-10-11 深圳市大疆创新科技有限公司 Pale, hélice, kit d'alimentation et véhicule aérien sans pilote
US10167846B2 (en) 2016-11-18 2019-01-01 Us Wind Technology Llc Eduction industrial power system

Citations (12)

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US1835018A (en) 1925-10-09 1931-12-08 Leblanc Vickers Maurice Sa Turbine having its rotating shaft transverse to the flow of the current
US5405246A (en) 1992-03-19 1995-04-11 Goldberg; Steven B. Vertical-axis wind turbine with a twisted blade configuration
EP1413748A1 (fr) 2002-10-22 2004-04-28 Dixi Holding b.v. Turbine eolienne a axe vertical avec systeme collecteur de vent
WO2005061173A1 (fr) * 2003-11-20 2005-07-07 Gck Technology, Inc. Ailettes vrillees complexes formees de multiples pieces et procede
FR2865777A1 (fr) * 2004-02-04 2005-08-05 Inst Nat Polytech Grenoble Turbomachine hydraulique
DE202008014838U1 (de) 2008-11-07 2009-01-15 Andrich, Detlef, Dr.-Ing. Freitragender Vertikalachs-H-Durchström-Auftriebs-Rotor
US20090257885A1 (en) 2006-12-22 2009-10-15 Kristian Balschmidt Godsk Wind Turbine With Rotor Blades Equipped With Winglets And Blades For Such Rotor
US20100322770A1 (en) 2007-12-04 2010-12-23 Coriolis-Wind Inc. Turbine blade constructions particular useful in vertical-axis wind turbines
US7997875B2 (en) 2010-11-16 2011-08-16 General Electric Company Winglet for wind turbine rotor blade
US8029241B2 (en) 2010-09-15 2011-10-04 General Electric Company Wind turbine rotor blade with aerodynamic winglet
US20110280708A1 (en) 2003-07-24 2011-11-17 Richard Cochrane Vertical axis wind turbins
US20120128500A1 (en) 2010-04-14 2012-05-24 Arcjet Holdings Llc Turbines

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1835018A (en) 1925-10-09 1931-12-08 Leblanc Vickers Maurice Sa Turbine having its rotating shaft transverse to the flow of the current
US5405246A (en) 1992-03-19 1995-04-11 Goldberg; Steven B. Vertical-axis wind turbine with a twisted blade configuration
EP1413748A1 (fr) 2002-10-22 2004-04-28 Dixi Holding b.v. Turbine eolienne a axe vertical avec systeme collecteur de vent
US20110280708A1 (en) 2003-07-24 2011-11-17 Richard Cochrane Vertical axis wind turbins
WO2005061173A1 (fr) * 2003-11-20 2005-07-07 Gck Technology, Inc. Ailettes vrillees complexes formees de multiples pieces et procede
FR2865777A1 (fr) * 2004-02-04 2005-08-05 Inst Nat Polytech Grenoble Turbomachine hydraulique
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